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Running tests using dynamic attach (com.sun.tools.attach API) I found that on linux attempt to attach intermittently fails with 2 kind of exceptions: java.io.IOException: well-known file is not secure at sun.tools.attach.LinuxVirtualMachine.checkPermissions(Native Method) at sun.tools.attach.LinuxVirtualMachine.<init>(LinuxVirtualMachine.java:111) at sun.tools.attach.LinuxAttachProvider.attachVirtualMachine(LinuxAttachProvider.java:63) at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:213) java.io.IOException: Connection refused at sun.tools.attach.LinuxVirtualMachine.connect(Native Method) at sun.tools.attach.LinuxVirtualMachine.<init>(LinuxVirtualMachine.java:118) at sun.tools.attach.LinuxAttachProvider.attachVirtualMachine(LinuxAttachProvider.java:63) at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:213) To reproduce extract attached archive and run script test_attach.sh, first script parameter - tested JDK. This script in loop executes simple test using dynamic attach. Test fails very intermittently (~ 1 of 500), but since we have many tests using dynamic attach possibility to face such failures is pretty high. Failure reproduces for example on vmsqe-p4-08.russia (SuSe 10), vmsqe-xeon-02.russia (RedHat 4). This failure mode has been seen in nightly testing. Here is the entry from my analysis report: New MM_REGRESSION failures (from 2008.02.28) * sun/management/jmxremote/bootstrap/LocalManagementTest.sh This test failed due to "IOException: well-known file is not secure" on Linux IA32 Server VM (machine jtg-linux17). Update: This failure might be related to the following: 6649594 3/4 Intermittent IOExceptions during dynamic attach on linux I'm checking with Alan. This failure mode has been seen in nightly testing. Here is the entry from my analysis report: New nsk.jvmti failures (from 2008.09.18) nsk/jvmti/AttachOnDemand/attach039 This test failed due to "IOException: well-known file is not secure" on Linux IA32 Server VM (machine tq-win2k-exe). Another sighting from nightly testing: New nsk.jvmti failures (from 2008.09.26) nsk/jvmti/AttachOnDemand/attach015 This test failed due to "IOException: well-known file is not secure" on Linux AMD64 Server VM (machine wowamd). This is an occurrence of the following bug: 6649594 3/4 Intermittent IOExceptions during dynamic attach on linux I will copy this entry to 6649594. Another sighting from nightly testing: New nsk.jvmti failures (from 2008.09.30) * nsk/jvmti/AttachOnDemand/attach045 This test failed due to "IOException: well-known file is not secure" on Linux IA32 Client VM (machine wowamd). This is an occurrence of the following bug: 6649594 3/4 Intermittent IOExceptions during dynamic attach on linux I will copy this entry to 6649594. We also regularly see intermittent failures in attach-on-demand test with following exception: java.io.IOException: Bad file number at sun.tools.attach.SolarisVirtualMachine.enqueue(Native Method) at sun.tools.attach.SolarisVirtualMachine.execute(SolarisVirtualMachine.java:107) at sun.tools.attach.HotSpotVirtualMachine.loadAgentLibrary(HotSpotVirtualMachine.java:40) at sun.tools.attach.HotSpotVirtualMachine.loadAgentLibrary(HotSpotVirtualMachine.java:61) at sun.tools.attach.HotSpotVirtualMachine.loadAgent(HotSpotVirtualMachine.java:85) at nsk.share.aod.AgentsAttacher.tryToLoadAgent(AgentsAttacher.java:68) at nsk.share.aod.AgentsAttacher.attachAgents(AgentsAttacher.java:48) at nsk.share.aod.AODTestRunner.doTestActions(AODTestRunner.java:60) at nsk.share.aod.AODTestRunner.runTest(AODTestRunner.java:112) at nsk.share.aod.AODTestRunner.main(AODTestRunner.java:144) I tried to run attach-on-demand tests with -XX:+StartAttachListener and with this flag tests don't fail. Looks like this bug also affects JDI tests against com.sun.jdi.ProcessAttach connector: nsk/jdi/AttachingConnector/attach/attach004 nsk/jdi/AttachingConnector/attachnosuspend/attachnosuspend002 Example of tests failures: http://vmsqe.russia.sun.com/execution/results/JDK7/PROMOTION/VM/b39/ConcMarkSweepGC_2/vm/solaris-i586/server/comp/solaris-i586_server_comp_nsk.jdi.testlist/ResultDir/attachnosuspend002/attachnosuspend002.log http://vmsqe.russia.sun.com/execution/results/JDK7/PROMOTION/VM/b39/ConcMarkSweepGC_2/vm/solaris-sparcv9/server/mixed/solaris-sparcv9_server_mixed_nsk.jdi.testlist/ResultDir/attach004/attach004.log Adding a number of entries from my nightly analysis report: New nsk.jvmti failures (from 2009.01.30) nsk/jvmti/AttachOnDemand/attach003 This test failed due to "ERROR: Unexpected IOException during VirtualMachine.attach: java.io.IOException: Permission denied" on Solaris AMD64 Server VM (machine vm-v20z-29). New nsk.jvmti failures (from 2009.01.23) nsk/jvmti/AttachOnDemand/attach013 This test failed due to "IOException: well-known file is not secure" on Linux IA32 Server VM -Xmixed (machine jtg-linux17). New nsk.jvmti failures (from 2009.01.05) nsk/jvmti/AttachOnDemand/attach037 This test failed due to "ERROR: Unexpected IOException during VirtualMachine.attach: java.io.IOException: Connection refused" on Linux AMD64 Server VM -Xmixed (machine vm-v20z-3). New nsk.jvmti failures (from 2008.12.12) nsk/jvmti/AttachOnDemand/attach020 This test failed due to "IOException: well-known file is not secure" on Linux AMD64 Server VM (machine vmnightly6). New nsk.jvmti failures (from 2008.11.28) nsk/jvmti/AttachOnDemand/attach042 This test failed due to "ERROR: Unexpected IOException during VirtualMachine.attach: java.io.IOException: Permission denied" on Solaris SPARC Server VM (machine vm-v215-02). New nsk.jvmti failures (from 2008.11.26) nsk/jvmti/AttachOnDemand/attach010 This test failed due to "ERROR: Unexpected IOException during VirtualMachine.attach: java.io.IOException: Connection refused" on Linux IA32 Client VM (machine inclusion). New nsk.jvmti failures (from 2008.10.30) nsk/jvmti/AttachOnDemand/attach014 This test failed due to "IOException: well-known file is not secure" on Linux AMD64 Server VM (machine wowamd). Update: In the 2009.01.31 nightly, the test failed due to "ERROR: Unexpected IOException during VirtualMachine.attach: java.io.IOException: Connection refused" on Linux AMD64 Server VM -Xcomp (machine intelsdv17). New nsk.jvmti failures (from 2008.10.01) nsk/jvmti/AttachOnDemand/attach012 This test failed due to "ERROR: Unexpected IOException during VirtualMachine.attach: java.io.IOException: Connection refused" on Linux IA32 Server VM (machine intelsdv17).
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